Diverse MF500M+ Podręcznik użytkownika - Strona 11

Przeglądaj online lub pobierz pdf Podręcznik użytkownika dla Przyrządy pomiarowe Diverse MF500M+. Diverse MF500M+ 16 stron. Magmeter

Calculation of Magnetite from MF500M readings

The magnetite meter measures the force on a powerful rare earth

magnet caused by the ferritic component of the magnetite. It is a

prerequisite of this technique that the containing pipe is stainless

steel which is not magnetic. In making the measurement the

instrument has a sensor that has some compensation for the

probe orientation in respect to gravitational forces.

Clearly the magnetite could be in any amount at any point in the

pipe, but in reality there are only really 2 likely scenarios. Firstly

the pipe is fully filled and in normal use there is continuously

flowing water filling the tube. In this case the magnetite is likely

to be evenly deposited on the inside surface. (Note this is not

guaranteed and could be affected by turbulent flow or surface

finish attributes). The second scenario is that the magnetite has

accumulated on one side of the pipe. This can be due to a

horizontal pipe that is not fully filled, or accumulation of flakes of

magnetite building up under gravity. The measurement rote

attempts to identify which type of deposit is in place and then

estimate the deposit thickness from the measurement.

Before starting the probe should be placed in a position at least

1m from any magnetic material and the instrument should be

zeroed. This removes any constant offset in the measurement

system to be removed from all subsequent measurements.

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